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Operational Interactions Between the South American Sea Lion Otaria

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Operational Interactions Between the South American Sea Lion Otaria Revista de Biología Marina y Oceanografía Vol. 50, Nº3: 479-489, diciembre 2015 DOI: 10.4067/S0718-19572015000400007 ARTICLE Operational interactions between the South American sea lion Otaria flavescens and purse seine fishing activities in northern Chile Interacciones operacionales entre lobo marino común Otaria flavescens y actividades de pesca de cerco en el norte de Chile Andrés González1, Rodrigo Vega1 and Eleuterio Yáñez2 1Departamento de Evaluación de Pesquerías, División de Investigación Pesquera Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile. [email protected] 2Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, P.O. Box 1020, Valparaíso, Chile Resumen.- Se analizan variables temporales, espaciales, ambientales, ecológicas y pesqueras que contribuyen a la variación del número de lobos marinos comunes (Otaria flavescens) que interactúan con las faenas de pesca de cerco industrial de la flota que opera en el norte de Chile (18°21’-24°00’S). Observadores científicos fueron embarcados en buques cerqueros entre febrero 2010 y diciembre 2011. Los datos fueron modelados usando modelos lineales generalizados (MLG) y modelos lineales generalizados mixtos (MLGM). Los resultados muestran que la variabilidad en el número de lobos marinos atraídos por las operaciones de pesca para alimentarse o intentar hacerlo, se explica por las variables: Hora del lance, Distancia a las colonias de lobos más cercanas, Temperatura superficial del mar, Especie objetivo del lance, Latitud y Número de aves marinas en torno a la embarcación. Luego del análisis detallado de las variables significativas, se puede concluir que los principales mecanismos que estarían actuando sobre la interacción entre lobos marinos y la operación de pesca serían: 1) una estrategia utilizada por los otáridos para disminuir el estrés por calor en el período reproductivo (verano), saliendo al mar en horas de máxima radiación solar (al mediodía), lo que incrementa notablemente su presencia dentro del cerco en lances realizados a menos de 20 millas náuticas de las colonias y 2) durante períodos cálidos, la presencia de ondas Kelvin descendentes disminuiría la disponibilidad de anchoveta (Engraulis ringens) en la zona, lo que provoca que la flota reoriente sus operaciones hacia el jurel (Trachurus murphyi), recurso que generalmente se captura a mayores distancias de la costa y de las colonias, disminuyendo significativamente la interacción con los lobos marinos. Palabras clave: Lobo marino común, Engraulis ringens, Índice ENSO Multivariado, Pesca de cerco Abstract.- This study analyzes temporal, spatial, environmental, ecological and fishing variables that contributed to variations in the number of South American sea lions (Otaria flavescens) that interacted with the industrial purse seine fishing operations in the north of Chile (18°21’-24°00’S). Scientific observers were placed onboard purse seiners vessels between February 2010 and December 2011. Data were modeled using generalized linear models (GLM) and generalized linear mixed models (GLMM). The results show that the variations in the number of sea lions attracted to fishing operations for feeding or attempting to feed on catches, depends on the following variables: Time of haul, Distance to the closest sea lion colony, Sea surface temperature, Target species of the haul, Latitude, and Number of seabirds circling the vessel. After detailed analysis of the significant variables, it can be concluded that the main mechanisms involved in the interaction between the sea lions and the fishing operations were: 1) a strategy used by the sea lions to decrease heat stress during the breeding period (summer) by entering the water when solar radiation is at its peak (around midday), thus notably increasing their presence within the nets during sets that are less than 20 nautical miles from the colonies; and 2) during warm periods the presence of downwelling Kelvin waves decreases the availability of anchovies (Engraulis ringens) in the area. This causes the fleet to change target species and focus on jack mackerel (Trachurus murphyi), which is generally captured further from the coast and the colonies, significantly decreasing the interaction with local sea lions. Key words: South American sea lion, Engraulis ringens, Multivariate ENSO Index, Purse seine INTRODUCTION In areas where the coast is intensively utilized for and marine mammals (Bjørge et al. 2002). In this context harvesting and farming marine resources, there is a interactions between pinnipeds and fishing operations potential for interactions between fish-related industries have been widely documented in the international Vol. 50, Nº 3, 2015 479 Revista de Biología Marina y Oceanografía literature (Ainley et al. 1982, Bonner 1982, Northridge 1985, the fishing operation (increased work time), reducing Hückstädt & Antezana 2003, Goetz et al. 2008, Reyes et catches and in some cases damaging fishing gear al. 2013). It is known that such interactions will occur in (Beverton 1985, Wickens 1995, Read 2008). The any place in the world where the distributions between operational interactions can also be negative for marine pinnipeds and fishing activities overlap (Riedman 1990, top predators due to the possibility of the animals coming Wickens 1995). into direct contact with the fishing system, leading to injury and even death (Oliva et al. 2003, Read 2008, Fertl Purse seine fishing operations conducted in the north 2009, Reyes et al. 2013). of Chile are denominated as Fishing Units XV, I and II for Chilean Administrative Regions for anchovy SUBPESCA The effects of the interaction on the pinnipeds (seals, 2011a)1 and jack mackerel (SUBPESCA 2011b)2. In the last sea lions and walrus) can be positive, due to the obvious decade, landings of these fisheries have represented on advantages of preying on a concentrated food source average 23% of fish landings in Chile (SERNAPESCA that is easy to access (Hückstädt & Antezana 2003). The 2002-2011)3. In the Administrative Regions mentioned, fishing operations concentrate the food source; leading both species are caught by the same fleet, which to a reduction in the amount of energy the sea lions spend comprises 66 purse seine fishing vessels, averaging 34 m in feeding (Fertl 2009). 3 of length (range between 22 and 44 m), and 400 m of hold The main operational interactions between sea lions 3 capacity (range between 140 and 670 m ; Bernal et al. and fisheries reported in Chile are predation of catch, 4 2010) . The operations of this fleet cover an extensive bycatch and incidental mortality of sea lions (Hückstädt area from the port of Arica in the north (18°21’S; 70°19’W) & Antezana 2003, Sepúlveda et al. 2007, Reyes et al. 2013), to Antofagasta in the south (23°38’S; 70°24’W), and while the damage to fishing gear is important in artisanal reaching 90 nautical miles from the coast (SUBPESCA fisheries (Sepúlveda et al. 2007). Hückstädt & Antezana 2011a). This area sustains a large population of South (2003) reported an average interaction of 21 sea lions per American sea lions (Otaria flavescens), with population set while Reyes et al. (2013), working with the trawling reaching 59,657 individuals distributed over 44 breeding industrial fleet that operates in the south-central Chile and haul-out colonies, thus representing 43.6% of the indicates a catch rate of 1.2 sea lion/trawl-1 and a mortality total population of this species in Chile (Bartheld et al. of 14.6%. 2008). Bycatch records are used to determine the extent Though sea lions are considered generalist predators, (temporal, spatial, by species) and magnitude (number of located on the upper levels of the food web (Beverton individuals per species) of these events, while studying 1985), in the study area the South American sea lion feeds the interactions, abundance of species that interact with mainly on anchovy (Sielfeld et al. 1997, Sielfeld 1999, fisheries, environmental and operational data are used to Arias-Schreiber 2003), which might lead to its interaction understand the nature of these interactions, and the with the purse seine fishing fleet that targets this species. importance of the factors that influence the level of these interactions. This is important for identifying specific Two types of interaction can be defined between mitigation solutions for the particular fishery (ACAP 2012). marine mammals with fishing activities: a biological (indirect) interaction due to competition for food, and an Considering the importance of understanding the main operational (direct) interaction due to predation, where mechanisms underlying the interaction processes between the animals enter the purse seine nets to feed, occasionally non-target species and fishing operations in the context leading to their capture in the net. In general, operational of an ecosystem approach to fisheries management (FAO interactions negatively affect the fishers by disturbing 2003), the current study aims to analyze different factors 1SUBPESCA. 2011a. Cuota global anual de captura para las unidades de pesquería de anchoveta y sardina española, regiones XV, I y II, año 2012. Informe Técnico (R Pesq), 108 pp. Subsecretaría de Pesca y Acuicultura, Valparaíso. 2SUBPESCA. 2011b. Cuota global anual de captura de jurel, para las unidades de pesquería de la XV-II, III-IV, V-IX y XIV-X regiones, año 2012. Informe Técnico (R Pesq), 129 pp. Subsecretaría de Pesca y Acuicultura, Valparaíso. 3SERNAPESCA. 2002-2011. Anuarios estadísticos de pesca. Servicio Nacional
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